A reinforcing plate assembly for a back door window frame and a back door assembly

Abstract

The application relates to the field of back doors, in particular to a reinforcing plate assembly for a back door window frame and a back door assembly, which comprises a back door inner plate reinforcing plate assembly arranged on a back door inner plate and a window frame upper beam assembly; the window frame upper beam assembly is arranged above the back door window frame; the back door inner plate reinforcing plate assembly is distributed on the side of the back door window frame; the application discloses a reinforcing plate assembly for a back door window frame, and mainly optimizes the structure of the back door; the reinforcing plate assembly is added on the back door inner plate, the overall structural strength of the back door assembly is improved, and the torsional mode and the bending mode of the back door assembly are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of back doors, in particular to a reinforcing plate assembly for a back door window frame and a back door assembly. BACKGROUND

[0002] With the increasing youth of customers in the automobile market, the sports style of the modeling design is more and more obvious, and the automobile rear part as a modeling visual sensitive area is also more and more designed to be clear in levels.

[0003] The original sheet metal process of the automobile back door cannot meet the current modeling requirement of the deep tail light and the more sleek back door streamline trend, and the plastic back door is a plastic process that has appeared on the market in recent years to replace the traditional sheet metal process, and is gradually accepted and recognized by a part of customers, the market recognition makes the plastic back door further develop, and the plastic back door is superior to the sheet metal back door in terms of lightweight, modeling freedom and integration, and the plastic back door will be the development trend in the future.

[0004] Based on the above factors, the plastic back door needs to be adopted to meet the modeling requirement.

[0005] According to the investigation, the main materials of the plastic back door inner plate on the market at present are SMC and PP+LGF40 long glass fiber materials.

[0006] Based on the global environmental protection requirement, the SMC material back door inner plate is not recyclable, and more and more plastic back door inner plates adopt the PP+LGF40 material.

[0007] When the plastic back door inner plate adopts the PP+LGF40 material, the elastic modulus of the material is much lower than that of the steel plate, in order to meet the performance requirement of the back door assembly, the plastic tail door on the market usually adopts the scheme of integrating the spoiler on the back door assembly, and increasing the cross section of the upper region of the back door to improve the torsional mode and the bending mode of the plastic back door.

[0008] With the increasing sharpness of the whole vehicle modeling design language, the hollow spoiler modeling related to the back door is more and more applied to the vehicle models inclined to sports style, but the hollow spoiler cannot be integrated on the plastic back door assembly, and the plastic back door assembly needs to separately dismount a hollow spoiler, and due to the existence of the hollow spoiler, the cross section of the upper region of the back door is greatly reduced, so a scheme considering both the hollow spoiler and the overall performance of the plastic back door needs to be considered. SUMMARY

[0009] The application aims to provide a reinforcing plate assembly for a back door, which can improve the overall modal performance of the back door assembly.

[0010] In order to achieve the above object, the technical scheme adopted by the present application is:

[0011] A reinforcing plate assembly for a back door window frame, comprising a back door inner plate reinforcing plate assembly arranged on a back door inner plate and a window frame upper cross beam assembly; the window frame upper cross beam assembly is arranged above the back door window frame; the back door inner plate reinforcing plate assembly is distributed on the side of the back door window frame.

[0012] The reinforcing plate assembly comprises two back door inner plate reinforcing plate assemblies; the two back door inner plate reinforcing plate assemblies are arranged on the two sides of the back door window frame in a symmetrical manner.

[0013] The back door inner plate reinforcing plate assembly comprises a back door inner plate reinforcing plate, and a plurality of reinforcing plate mounting holes are arranged on the back door inner plate reinforcing plate; a back door hinge mounting plate, a back door reinforcing connecting plate and a back door support rod mounting plate are arranged on the back door inner plate reinforcing plate.

[0014] The back door inner plate reinforcing plate comprises a longitudinal plate, one end of the longitudinal plate is provided with an upper connecting plate, and the other end of the longitudinal plate is provided with a lower connecting plate; the back door inner plate reinforcing plate is in a C shape; the upper connecting plate is arranged above the back door window frame; the lower connecting plate is arranged below the back door window frame; and the longitudinal plate is arranged on the side of the back door window frame.

[0015] The upper connecting plate and the lower connecting plate are provided with reinforcing plate positioning holes.

[0016] The edge of the back door inner plate reinforcing plate is provided with a reinforcing plate flange.

[0017] The window frame upper cross beam assembly comprises a cross beam plate, and a cross beam mounting hole is arranged on the cross beam plate.

[0018] The cross beam plate is provided with a cross beam reinforcing rib and a cross beam positioning hole.

[0019] The edge of the cross beam plate is provided with a cross beam flange.

[0020] A back door assembly comprises a back door inner plate, and a reinforcing plate assembly is arranged on the back door inner plate; the reinforcing plate assembly comprises a back door inner plate reinforcing plate assembly and a window frame upper cross beam assembly; the back door inner plate reinforcing plate assembly and the window frame upper cross beam assembly are distributed around the back door window frame.

[0021] The present application has the advantages that:

[0022] The present application discloses a reinforcing plate assembly for a back door window frame, and mainly optimizes the structure of the back door; by increasing the reinforcing plate assembly on the back door inner plate, the overall structural strength of the back door assembly is improved, and the torsional mode and the bending mode of the back door assembly are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Brief description of the drawings and the marks in the drawings for the present invention specification:

[0024] Figure 1 The back door inner plate assembly structure schematic diagram of the present invention patent.

[0025] Figure 2 The back door double-layer mounting point area structure section schematic diagram of the present invention patent.

[0026] Figure 3 The back door window frame left reinforcement plate assembly installed on the back door inner plate section schematic diagram of the present invention patent.

[0027] Figure 4 The back door inner plate structure schematic diagram of the present invention patent.

[0028] Figure 5 The back door inner plate sheet metal mounting structure section schematic diagram of the present invention patent.

[0029] Figure 6 The back door window frame left reinforcement plate assembly structure schematic diagram of the present invention patent.

[0030] Figure 7 The window frame upper beam structure schematic diagram of the present invention patent.

[0031] Figure 8 The back door window frame left reinforcement plate assembly installed on the back door inner plate schematic diagram of the present invention patent.

[0032] The marks in the above drawings are:

[0033] 1, back door inner plate, 2, back door window frame reinforcement plate assembly, 3, window frame upper beam. DETAILED DESCRIPTION

[0034] The specific embodiments of the present invention are further described in detail below with reference to the drawings.

[0035] A kind of reinforcement plate assembly for back door window frame, including the back door inner plate reinforcement plate assembly 2 being arranged on back door inner plate 1 and window frame upper beam assembly 3;The window frame upper beam assembly 3 is arranged above back door window frame;The back door inner plate reinforcement plate assembly 2 is distributed in the side of back door window frame;The present application discloses a kind of reinforcement plate assembly for back door window frame, the present application mainly is to the structure of back door is optimized design, by increasing reinforcement plate assembly on back door inner plate 1, the overall structural strength of back door assembly is improved well, simultaneously improve the torsional mode and bending mode of back door assembly.

[0036] Specifically, in actual implementation, the window frame upper beam assembly 3 is arranged directly above the back door window frame, and the back door inner panel reinforcing plate assembly 2 is arranged at the side of the back door window frame, and two back door inner panel reinforcing plate assemblies 2 are arranged in actual arrangement, so that the reinforcing plate assembly disclosed by the application can be wrapped above and at the side of the back door window frame, thereby improving the overall structural strength of the back door and the modal performance of the back door window frame.

[0037] In addition, the reinforcing plate assembly in the application includes two back door inner panel reinforcing plate assemblies 2, which are symmetrically arranged at the two sides of the back door window frame, and the two back door inner panel reinforcing plate assemblies 2 are symmetrically arranged in the application, which ensures the symmetry of the overall structure of the back door inner panel 1 and the dynamic balance of the subsequent operation of the entire back door.

[0038] Further, the back door inner panel reinforcing plate assembly 2 in the application includes a back door inner panel reinforcing plate 21, which is provided on the back door inner panel 1 to increase the local structural strength of the back door inner panel 1, and a plurality of reinforcing plate mounting holes 23 are provided on the back door inner panel reinforcing plate 21, which facilitates the subsequent fixing and connection of the back door inner panel reinforcing plate 21 on the back door inner panel 1, and the back door hinge mounting plate 22, the back door reinforcing connecting plate 24 and the back door support rod mounting plate 25 are provided on the back door inner panel reinforcing plate 21, which increases the structural strength of the back door inner panel 1 and the back door inner panel reinforcing plate 21 to some extent, and facilitates the stability of the connection between the hinge, the electric support rod and the back door during subsequent arrangement, and the back door hinge mounting plate is a stepped plate structure, which is a greater optimization.

[0039] Further, in the application, the back door inner plate reinforcing plate 21 comprises a longitudinal plate 211, which is arranged in the vertical direction in the front view of the back door, and mainly matches the side of the back door window frame in subsequent use; the structural strength of the side of the back door window frame is ensured; in addition, in the application, the longitudinal plate 211 is provided with an upper connecting plate 212 at one end and a lower connecting plate 213 at the other end; in the application, the upper connecting plate 212 and the lower connecting plate 213 are arranged in the horizontal direction, and the upper connecting plate 212 and the lower connecting plate 213 are arranged above and below the back door window frame; from the front view, the back door inner plate reinforcing plate 21 of the application is in the shape of C; the upper connecting plate 212 is arranged above the back door window frame; the lower connecting plate 213 is arranged below the back door window frame; the longitudinal plate 211 is arranged beside the back door window frame; in actual use, the back door inner plate reinforcing plate 21 is equivalent to being clamped beside the back door window frame, so that the back door inner plate reinforcing plate 21 disclosed in the application can be positioned and limited with the back door window frame during actual installation; the stability of the back door inner plate reinforcing plate assembly is ensured.

[0040] Further, in the application, the upper connecting plate 212 and the lower connecting plate 213 are provided with reinforcing plate positioning holes; the reinforcing plate positioning holes are arranged to facilitate cooperation with the positioning pins on the back door, thereby ensuring the accuracy and stability of the placement position of the back door inner plate reinforcing plate 21; the reinforcing plate positioning holes can be respectively called reinforcing plate main positioning holes 27 and reinforcing plate auxiliary positioning holes 271 due to different arrangement positions.

[0041] Further, in the application, the back door inner plate reinforcing plate 21 is provided with a reinforcing plate flange strip 26 at the edge; one function of the reinforcing plate flange strip 26 is to increase the overall structural strength of the back door inner plate reinforcing plate 21, and in addition, in the application, the reinforcing plate flange strip 26 (flange structure) is increased at the boundary area of the back door inner plate reinforcing plate 21, as shown in the figure, the flange structure penetrates from the hinge mounting point area to the lower part of the window frame, and forms a corner feature at the corner area of the lower part of the window frame; based on such arrangement, the mechanical transmission can be dispersed to the window frame lower beam structure of the inner plate.

[0042] Further, in the application, the window frame upper beam assembly 3 comprises a beam plate 31, which is a plate structure and is mainly arranged directly above the back door window frame, and plays a role in increasing the structural strength of the back door and the upper part of the back door window frame; in addition, in the application, the beam plate 31 is provided with a beam mounting hole 33; the arrangement of the beam mounting hole 33 facilitates the mounting and fixing of the beam plate 31 on the back door inner plate 1.

[0043] Further, the beam plate 31 is provided with a beam reinforcing rib 32 and a beam positioning hole in the application; the beam reinforcing rib 32 is provided to play a reinforcing role, mainly to ensure the structural strength of the beam plate 31, and in addition, the beam plate 31 is provided with a beam positioning hole, which mainly involves the purpose of ensuring the positioning operation during the installation of the beam; here, the beam positioning hole is also divided into multiple types of holes, which can be divided into a beam main positioning hole 34 and a beam auxiliary positioning hole 341.

[0044] Further, the beam plate 31 is provided with a beam reinforcing rib 32 and a beam positioning hole in the application; the beam reinforcing rib 32 is provided to play a reinforcing role, mainly to ensure the structural strength of the beam plate 31, and in addition, the beam plate 31 is provided with a beam positioning hole, which mainly involves the purpose of ensuring the positioning operation during the installation of the beam; here, the beam positioning hole is also divided into multiple types of holes, which can be divided into a beam main positioning hole 34 and a beam auxiliary positioning hole 341.

[0045] A back door assembly, comprising a back door inner plate 1, the back door inner plate 1 is provided with a reinforcing plate assembly; the reinforcing plate assembly comprises a back door inner plate reinforcing plate assembly 2 and a window frame upper beam assembly 3; the back door inner plate reinforcing plate assembly 2 and the window frame upper beam assembly 3 are distributed around the window frame of the back door; in actual installation, the back door inner plate reinforcing plate 21 in the back door inner plate reinforcing plate assembly 2 is fixedly connected to the back door inner plate 1 first, and then the beam plate 31 in the window frame upper beam assembly 3 is installed on the back door inner plate 1, and here the end of the beam plate 31 is overlapped with the back door inner plate reinforcing plate 21; such an arrangement can ensure the structural strength of the connection and facilitate the arrangement of the entire reinforcing plate assembly on the back door inner plate 1; in addition, the overlapping part of the beam plate 31 and the back door inner plate reinforcing plate 21 is the subsequent hinge installation position, which can ensure the structural strength of the back door hinge installation position.

[0046] The assembly method of the reinforcing assembly is to install the back door inner plate reinforcing plate assembly first, and then install the window frame upper beam assembly on the back door inner plate after the back door inner plate reinforcing plate assembly is installed; such an installation method can connect the back door inner plate reinforcing plate assembly with the upper beam assembly during subsequent installation, thereby ensuring the integrity of the entire reinforcing assembly, and in addition, the above installation arrangement enables the back door inner plate reinforcing plate assembly and the window frame upper beam assembly to specifically position each other, and specifically, the back door hinge installation plate in the application is a stepped plate structure; the stepped plate structure is in contact with the beam plate, thereby playing a good mutual positioning role; in order to ensure the cooperation, the end of the beam plate is also stepped.

[0047] The relative position accuracy of the back door inner plate reinforcing plate assembly and the window frame upper beam assembly is well ensured.

[0048] Specifically,

[0049] The application discloses a reinforcing plate assembly for a back door window frame, mainly relates to a structural design for improving the modal of a plastic back door; in the application, the back door inner plate reinforcing plate assembly 2 and the window frame upper beam assembly 3 are designed, and the back door inner plate reinforcing plate assembly 2 and the window frame upper beam assembly 3 are required to respectively reinforce the corner area of the upper part of the back door assembly and the area on both sides of the window frame of the back door.

[0050] In actual arrangement, the window frame upper beam assembly 3 is connected between the two back door inner plate reinforcing plate assemblies 2, so as to make up for the problem that the overall performance of the back door is reduced due to the insufficient section of the upper window frame of the back door.

[0051] In addition, in the application, the back door inner plate reinforcing plate assembly 2 is fixed on the back door inner plate 1 in a mixed connection mode of screwing and riveting, the window frame upper beam assembly 3 is fixed on the back door inner plate 1 in a screwing mode, and a semi-closed structure of the overall reinforcement of the back door window frame area is formed.

[0052] Based on the above structural design, the strength of the back door assembly can be reinforced on the overall structure, and especially the modal performance of the window frame area of the plastic back door can be improved; specifically, the rigidity of the upper window frame area of the back door and the rigidity of the hinge corner area of the back door can be simultaneously enhanced, and the problem that the performance requirements of the back door assembly cannot be met when the hollow spoiler cannot be integrated into the plastic back door assembly is solved, and more variable freedom is provided for the design of the shape.

[0053] The specific design is as follows; (in the application, because the back door inner plate reinforcing plate assembly 2 is arranged and placed in different positions, the following can be done in actual use, the back door inner plate reinforcing plate assembly arranged on the left side of the back door window frame is called the back door inner plate left reinforcing plate assembly, and the back door inner plate reinforcing plate assembly arranged on the right side of the back door window frame is called the back door inner plate right reinforcing plate assembly (here, left and right are taken as the reference to facing the automobile; that is, the front of the person facing the automobile).

[0054] I. In structure:

[0055] The back door inner plate 1 is the overall load-bearing structure of the entire back door assembly, and plays a role of dispersing concentrated stress to other structural beams of the back door, so that the back door can still be normally opened and closed under a series of working conditions such as vehicle opening and closing durability, jolt durability and strut axial force.

[0056] The back door inner plate 1 is designed with a BOSS column form (the BOSS column is a column-shaped mounting point structure for mounting sheet metal parts) positioning structure in the area of the back door inner plate left reinforcing plate assembly, the window frame upper beam assembly and the back door inner plate right reinforcing plate assembly, and the mounting structure of the sheet metal part is designed in a dog house plus spring piece form, a reinforcing rib is designed around the dog house, and the reinforcing rib is connected to the vertical surface area of the back door to ensure the effective dispersion of concentrated stress.

[0057] The weakest area of the back door assembly structure is the window frame area, and the design of the panel in this area directly affects the torsional mode and bending mode of the back door as a whole, so the window frame area of the back door inner panel 1 is designed with a reinforcing rib structure that extends around the entire window frame.

[0058] The left and right back door inner panel reinforcement plate assemblies are symmetrical, and only the structure design of the left back door inner panel reinforcement plate assembly will be described below.

[0059] The left back door inner panel reinforcement plate assembly improves the bending mode and torsional mode of the back door assembly. The hinge area significantly contributes to the torsional mode, and the window frame area significantly contributes to the bending mode. Therefore, the left back door inner panel reinforcement plate assembly extends from the hinge area to the lower corner area of the back door window frame to form a C-shaped structure, and a flange surface structure is added at the edge. The flange surface structure extends from the hinge area to the corner area of the back door window frame. At the same time, three rivet points and nine bolt mounting points are arranged on the left back door inner panel reinforcement plate assembly, which is fixed to the back door inner panel 1 by riveting and bolting. The boss weight reduction hole is made on the large area of the left back door inner panel reinforcement plate assembly to balance the performance and weight.

[0060] The main function of the window frame upper beam assembly 3 is to improve the torsional mode of the back door assembly. The beam reinforcing rib 32 and the beam positioning hole are provided on the beam plate 31. The window frame upper beam assembly 3 penetrates through the entire window frame upper beam.

[0061] The edge area of the beam plate 31 is formed with a flange structure, and six mounting points are arranged on the window frame upper beam assembly 3 for fixing the window frame upper beam assembly 3 to the back door inner panel 1. Meanwhile, the boss weight reduction hole structure is made on the large area of the window frame upper beam to reduce weight.

[0062] II. The connection relationship between the components is as follows:

[0063] The left back door inner panel reinforcement plate assembly is positioned by the positioning pin G and the positioning pin H on the back door inner panel 1, and the right back door inner panel reinforcement plate assembly is positioned by two positioning pins symmetrical to the positioning pin G and the positioning pin H on the back door inner panel 1. These two small assemblies are fixed to the back door inner panel 1 by bolting and riveting.

[0064] The window frame upper beam assembly 3 is positioned by the positioning pin G on the back door inner panel 1 and the symmetrical positioning pin. The two sides of the window frame upper beam assembly 3 are respectively lapped onto the left back door inner panel reinforcement plate assembly and the right back door inner panel reinforcement plate assembly, and are fixed by bolts. Other bolt holes are fixed by bolts.

[0065] Finally, a semi-closed force transmission channel is formed in the window frame area of the back door assembly.

[0066] The application is further described in detail below with reference to the accompanying drawings;

[0067] The rear door inner panel 1:

[0068] As Figure 4 shown;

[0069] The plastic rear door window frame area is designed with a reinforcing structure.

[0070] [A] The area is designed with a transverse reinforcing rib, and the transverse rib is decomposed to other reinforcing areas of the inner panel by an X-shaped rib.

[0071] [B] The inner panel in the area is designed with a fishbone-shaped reinforcing rib, the main rib of the fishbone-shaped reinforcing rib penetrates from [A] to [B], and the small reinforcing ribs connected by the main rib are arranged transversely and extended to the vertical surfaces on both sides of the rear door window frame.

[0072] [C] The inner panel in the area is designed with a reinforcing beam in the form of a large cross section, and a glue-coated surface is added to the reinforcing beam to form a closed cavity for bonding with the outer panel of the rear door.

[0073] A doghouse structure (a cavity type mounting point structure for mounting sheet metal parts) is designed on the rear door inner panel 1, a snap spring is arranged on the doghouse structure, which is actually a sink structure, and the snap spring is arranged in the sink to increase the local structural strength; to ensure that the bolt torque does not damage the inner panel under the condition of 7N, the cross-sectional structure is as shown in Figure 5 the cross section D-D.

[0074] The rear door inner panel left reinforcing plate assembly: the rear door inner panel reinforcing plate 21 is provided with a rear door hinge mounting plate 22, a rear door reinforcing connecting plate 24, and a rear door brace rod mounting plate 25;

[0075] The rear door hinge mounting plate 22, the rear door brace rod mounting plate 25, and the rear door reinforcing connecting plate 24 are welded to the rear door inner panel reinforcing plate 21 by spot welding and two-way welding to form the rear door inner panel reinforcing plate assembly 2.

[0076] The upper connection hinge area of the rear door inner panel left reinforcing plate assembly extends to the lower edge corner area of the window frame, and a local reinforcing plate is made in the hinge and brace rod area to improve the point stiffness of the hinge area and the brace rod area.

[0077] The rear door left reinforcing plate connecting plate is a connecting treatment of the U-shaped rear door inner panel 1 left reinforcing plate, which weakens the opening problem of the window frame corner area of the rear door inner panel 1 left reinforcing plate.

[0078] The edge area of the rear door inner panel reinforcing plate 21 is increased with a flanging structure, as shown in Figure 6The flange structure of the middle E~F area penetrates from the hinge mounting point area to the lower part of the window frame, and makes a corner feature at the corner area of the lower part of the window frame, to ensure that the mechanical transmission can be dispersed to the lower beam [C] structure of the inner plate of the window frame.

[0079] As shown in Figure 6 The left reinforcement plate assembly of the back door inner plate is arranged with 9 mounting points with a hole diameter of Φ8mm, and a main positioning hole and an auxiliary positioning hole are designed for accurately mounting the left reinforcement plate assembly of the back door inner plate to the back door inner plate 1.

[0080] The structure of the right reinforcement plate assembly of the back door inner plate is symmetrically designed with the left reinforcement plate assembly of the back door inner plate.

[0081] The upper beam assembly 3 of the window frame is mainly provided with a beam reinforcing rib 32 and a beam positioning hole on the beam plate 31, and penetrates through the entire upper beam of the window frame.

[0082] Meanwhile, a flange structure is added to the beam plate 31.

[0083] As shown in Figure 7 The upper beam of the window frame is arranged with 6 mounting holes with a hole diameter of Φ8mm, and a main positioning hole and an auxiliary positioning hole are arranged at both ends.

[0084] The left reinforcement plate assembly of the back door inner plate is first positioned by the positioning pin G and the positioning pin H on the inner plate, to ensure that the hinge mounting hole and the electric support rod bracket mounting hole on the left reinforcement plate assembly of the back door inner plate match the hole positions of the back door inner plate 1.

[0085] Then, the left reinforcement plate assembly of the back door inner plate is connected to the back door inner plate 1 by 9 bolts.

[0086] As shown in Figure 8 A rivet J is arranged at the back door hinge mounting surface and riveted to the back door inner plate 1, a rivet K is arranged at the back door support rod bracket mounting surface and riveted to the back door inner plate 1, and a rivet L is arranged on the left reinforcement plate connecting plate of the back door and riveted to the back door outer plate.

[0087] The assembly method of the right reinforcement plate assembly of the back door inner plate is consistent with that of the left reinforcement plate assembly of the back door inner plate.

[0088] The upper beam assembly 3 of the window frame uses the back door window frame left reinforcement plate positioning pin G and the back door window frame right reinforcement plate positioning pin at the symmetric position on the back door inner plate 1 as the main positioning pin and the auxiliary positioning pin.

[0089] Then the window frame upper beam assembly 3 is connected to the rear door inner panel 1 by bolts through the six mounting holes on the beam plate 31, and the four corner mounting points of the beam plate 31 are double-layer plate bolted with the rear door inner panel left reinforcement plate assembly, the rear door inner panel right reinforcement plate assembly and the rear door inner panel 1, as shown in Figure 2 The design can meet the requirement of forming the upper surrounding structure in the rear door window frame area, and obviously improves the torsional mode and bending mode of the rear door assembly.

[0090] Obviously, the specific implementation of the present application is not limited by the above-mentioned manner, and various non-essential improvements made by adopting the method concept and technical solutions of the present application are within the protection scope of the present application.

Claims

1. A reinforcement plate assembly for a back door window frame, characterized by, The back door inner plate reinforcing plate assembly is arranged on the back door inner plate, and the window frame upper cross beam assembly is arranged above the back door window frame. The reinforcing plate assembly includes two back door inner plate reinforcing plate assemblies. The back door inner plate reinforcing plate assembly includes a back door inner plate reinforcing plate. The back door inner plate reinforcing plate includes a longitudinal plate, one end of which is provided with an upper connecting plate, and the other end of which is provided with a lower connecting plate. The back door inner plate reinforcing plate is in a C shape. The upper connecting plate is arranged above the back door window frame. The lower connecting plate is arranged below the back door window frame. The longitudinal plate is arranged on the side of the back door window frame. The window frame upper cross beam assembly includes a cross beam plate. The back door hinge mounting plate is in a stepped plate structure. The end of the cross beam plate is also stepped. The end of the cross beam plate is arranged in a lap joint manner with the back door inner plate reinforcing plate. The back door inner plate reinforcing plate is provided with a plurality of reinforcing plate mounting holes. The back door inner plate reinforcing plate is provided with a back door hinge mounting plate, a back door reinforcing connecting plate and a back door support rod mounting plate.

2. A reinforcement plate assembly for a back door window frame according to claim 1, characterized in that, The back door window frame region is designed with a reinforcing structure.

3. A reinforcement plate assembly for a back door window frame according to claim 1, characterized in that, The back door window frame region includes an A region, a B region and a C region.

4. A reinforcement plate assembly for a back door window frame according to claim 1, characterized in that, The A region is designed with a horizontal reinforcing rib, and the horizontal rib stress is decomposed to other reinforcing regions of the inner plate through an X-shaped rib.

5. A reinforcement plate assembly for a back door window frame according to claim 1, wherein The B region is designed with a fishbone-shaped reinforcing rib, and the main rib of the fishbone-shaped reinforcing rib penetrates from the A region to the B region, and the small reinforcing ribs connected with the main rib are arranged horizontally and extended to the vertical surfaces on both sides of the back door window frame.

6. A back door assembly characterized by, The C region is designed with a reinforcing beam in a large cross-section form, and a glue-coated surface is added to the reinforcing beam to form a closed cavity by bonding with the back door outer plate. The upper connecting plate and the lower connecting plate are provided with reinforcing plate positioning holes. The edge of the back door inner plate reinforcing plate is provided with a reinforcing plate turn-up strip. The cross beam plate is provided with a cross beam reinforcing rib and a cross beam positioning hole. The edge of the cross beam plate is provided with a cross beam turn-up. The back door inner plate is provided with the reinforcing plate assembly as claimed in any one of claims 1-5. The reinforcing plate assembly includes a back door inner plate reinforcing plate assembly and a window frame upper cross beam assembly. The back door inner plate reinforcing plate assembly and the window frame upper cross beam assembly are distributed around the back door window frame.

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